Aluminum foil
Bug spray
Cooler
Dish soap/sponge
Emergency first aid kit
Fire grate 
Grocery basics
Hammock 
Iodine water purifying tablets
Jugs of water (refillable)
Knife 
Light (lighter/headlamps/flashlight)
Mess kit 
Napkins/paper towels
Oversized tongs (for the campfire)
Portable charger
Queen sized air mattress and pump
Rain ponchos
Sunscreen
Tent gear
Unlikely necessary but: bear spray!
Very strong tape
Wet wipes
Xtra blankets
Yarn/rope/twine
Ziploc baggies & trash bags (compostable!)